Chemistry and Physics. 141 
solution acts by absorbing the blue —occurred to him, 
concluded that the English plates must contain some substance 
which absorbed green light more strongly than blue. ) 
Sensitiveness of the silver bromide for yellow. Such a substance 
he found in corallin, the solution of which showed a strong band 
at D in its absorption spectrum, while at the same time, it trans- 
Fe * B. 
4. On the Existence of Chromium dioxide.—H1n1z has investi- 
gated, in the laboratory of Dr. Lothar Meyer, the methods o 
Preperecion and properties of chromium dioxide. He used: (1) 
anquelin a mposing chromic 
the action of chromic acid on chromic hydrate. 
dichromate: product was a brown hydrate. (6) 
by the aetce. of chloride of lime on chromic hydrate ; no result, 
